BACKGROUND
Field
[0001] This document relates to an electron transport compound and an organic light emitting
device comprising the same.
Related Art
[0002] In general, an organic light emitting display is a self-emitting display for emitting
light by electrically exciting a fluorescent compound and has been spotlighted as
a future generation display that can solve problems of a liquid crystal display as
it can be driven in a low voltage, easily reduce a thickness, have a wide viewing
angle and a fast response speed, etc.
[0003] The organic light emitting device comprises an organic emitting layer between an
anode and a cathode. The organic light emitting device forms an exciton, which is
a hole-electron pair, by coupling a hole received from the anode and an electron received
from the cathode within the organic light emitting layer and emits light by generating
energy when the exciton returns to a ground level. The organic light emitting device
further comprises a hole(electron) injecting layer and/or a hole(electron) transporting
layer between the anode or the cathode and the emitting layer.
[0004] A process of manufacturing organic light emitting device is as follows.
[0005] (1) First, an anode is formed on a transparent substrate. As the material for anode,
Indium Tin Oxide (ITO) is generally used.
[0006] (2) A hole injecting layer (HIL) is formed on the anode. As the HIL, copper phthalocyanine
(CuPc) is generally used and the thickness of the HIL is 10nm to 30nm.
[0007] (3) Next, a hole transport layer (HTL) is formed on the HIL. As the hole transport
layer, 4,4'-bis[N-(1-naphthyl)-N-phenthylamino]-biphenyl (NPB) is generally used and
the thickness of the HTL is 30nm to 60nm.
[0008] (4) An organic emitting layer is formed on the HTL. The organic emitting layer may
comprise a host and a dopant. In a case of green light emitting layer, tris(8-hydroxy-quinolatealuminum
(Alq
3) as the host is deposited in a thickness of about 30 to 60nm and as a dopant, N-Methylquinacridone
(MQD) is doped in the host.
[0009] (5) An electron transport layer (ETL) and an electron injecting layer (EIL) are consecutively
formed or one electron injecting and transport layer is formed on the organic emitting
layer. In a case of green light emitting layer, because Alq
3 of (4) has good electron transport ability, an electron injecting/transport layer
may not be separately used.
[0010] (6) Next, a cathode is formed and finally a protective layer is stacked.
[0011] However, conventional organic light emitting device, particularly, an electron transport
compound for an electron injecting layer or an electron transport layer has problems
of low electron transport efficiency in using for a display device and difficulty
of deposition. Further, a conventional electron transport compound has a problem of
a short lifetime due to high possibility of crystallization and deterioration.
SUMMARY
[0012] An object of this document is to provide an organic light emitting device having
a pyrene based electron transport compound and an electron injecting and transport
layer comprising the electron transport compound.
[0013] Another object of this document is to provide an electron transport compound that
has high electron transport efficiency, and good deposition characteristics, prevents
crystallization, and has no influence on a lifetime of organic light emitting device.
[0014] Another object of this document is to provide an organic light emitting device having
high brightness, high efficiency, and a long lifetime using an electron transport
compound.
DESCRIPTION
[0015] Hereinafter, embodiments are described in detail.
[0017] In order to achieve the object, this document provides a pyrene based electron transport
compound having chemical formula 1.
[0018]
[0019] Pyrene based compound of chemical formula 1-1 is a very important compound among
hydrocarbons. In the pyrene based compound, carbons are numbered clockwise starting
with a carbon having a substituent A-C. Accordingly, an electron transport compound
according to an embodiment of this document comprises a pyrene based compound in which
A-C is bonded to carbon 1 and 6, and B is bonded to carbon 3 and 8. The substituents
A, B, and C may be substituted or not substituted.
[0020] The electron transport compound is a compound that injects an electron from a cathode
to other layer or transports an injected electron to other layers. For example, in
organic light emitting device, an electron transport compound is a compound that may
be a material of an electron injecting layer, an electron transport layer, or an electron
injecting and transport layer in which the electron injecting layer and the electron
transport layer are mixed.
[0021] In this document, the electron injecting and transport layer is used to generally
designate layers, which are related to injecting and transporting of an electron,
such as an electron injecting layer, an electron transport layer, or an electron injecting
and transport layer in which the electron injecting layer and the electron transport
layer are mixed.
[0022] A that is substituted or is not substituted may be selected from a group consisting
of pyridinyl, quinolinyl, isoquinolinyl, quinoxalinyl, bipyridinyl, terpyridinyl,
and phenanthrolinyl.
[0023] Further, B and C that are substituted or are not substituted may be selected from
a group consisting of phenyl, biphenyl, naphthyl, fluorenyl, terphenyl, phenanthrolinyl,
phenanthryl, and anthryl.
[0024] When the A, B, and C are substituted, a substituent of the A, B, and C may be selected
from a group consisting of aryl, alkyl, aryloxy, alkoxy, allylamino, alkylamino, halogen,
and cyano.
[0025] Further, when the A, B, and C are substituted, a substituent of the A, B, and C may
be selected from a group consisting of phenyl, biphenyl, triphenylmethyl, phenylethylidene,
diphenylethylidene, phenylmethylidyne, phenoxy, tolyoxy, methyl, ethyl, propyl, i-propyl,
t-butyl, cyclohexyl, diphenylamino, morpholine, methoxy, ethoxy, propoxy, butoxy,
dimethylamino, diphenylamino, fluorine, and chlorine.
[0026] The A that is substituted or is not substituted is given by chemical formulas 1-2
and 1-3.
[0027]
[0028] where any one of R1, R2, R3, R4, R5, and R6 is CH3, and the remaining ones are H.
[0029]
[0030] Similarly, the B and C that are substituted or not substituted are given by chemical
formula 1-4.
[0031] [Chemical formula 1-4]
[0032] Various forms of electron transport compounds can be formed by combining the pyrene
based electron transport compound of chemical formula 1-1 with substituents of chemical
formulas 1-2 to 1-4. The electron transport compounds can be easily selected by those
skilled in the art according to necessity of brightness, color purity, or a driving
voltage.
[0033] This document provides organic light emitting device having the electron injecting
and transport layer comprising the electron transport compound described above. The
electron injecting and transport layer may be one or both of an electron injecting
layer or an electron transport layer. The electron injecting and transport layer may
be formed between an organic light emitting layer and a cathode. The electron injecting
and transport layer may have a different layer position when participating in injecting
and transporting of an electron as described above.
[0034] Below, synthesis examples of some compounds of the pyrene based electron transport
compounds of chemical formula 1-1 are described. Only synthesis examples of some compounds
are described, but synthesis examples of other pyrene based electron transport compounds
of chemical formula 1-1 are similar to these synthesis examples, the synthesis examples
can be easily executed by those skilled in the art, and thus descriptions thereof
will be omitted.
[0035] [Synthesis Example]
[0036] 1,5-di(4-(3'-pyridine)phenyl)-3,6-diphenylpyrene among electron transport compounds
of an electron injecting and transport layer of organic light emitting device according
to a first embodiment of this document is synthesized as follows.
[0037] (1) Synthesis of 1,5-di(4-(3'-pyridine)-phenyl)pyrene
[0038]
[0039] 8.3g (0.0416mol) of 4-(3'-pyridine)phenyl boronic acid and 5g (0.0139mol) of 1,5-dibromopyrene
were put in 100mL of anhydrous THF and they were stirred in a dried three neck round
bottom flask.
[0040] 1.0g of tetrakis(triphenylphosphine)palladium(0) and 15g of potassium carbonate were
melted in 100mL of H
2O and added to the flask. Then they were stirred for 24 hours in a bath of 100□ and
when a reaction was ended, THF was removed from a reaction mixture.
[0041] Thereafter, the reaction mixture was extracted using dichloromethane and water and
distilled under a reduced pressure, then the distilled mixture was purified by passing
through a silica gel column. The purified mixture was distilled under a reduced pressure
again. The purified and distilled mixture was recrystallized using dichloromethane
and methanol and filtered. Then 1,5-di(4-(3'-pyridine)-phenyl)pyrene was obtained.
[0042] (2) Synthesis of 3,6-dibromo-1,5-di(4-(3'-pyridine)-phenyl)pyrene
[0043]
[0044] 1,5-di(4-(3'-pyridine)-phenyl)pyrene was put in 80mL of acetic acid and they were
stirred in a dried three neck round bottom flask. After 1.9g (0.0118mol) of bromine
(Br
2) was added to the reaction mixture at a room temperature and when a reaction was
ended, filtering was performed. By washing and then drying the reaction mixture with
excessive distilled water, 3,6-dibromo-1,5-di(4-(3'-pyridine)-phenyl)pyrene was obtained.
[0045] (3) Synthesis of 1,5-di(4-(3'-pyridine)phenyl)-3,6-diphenylpyrene
[0046]
[0047] 3g (0.0045mol) of 3,6-dibromo-1,5-di(4-(3'-pyridine)-phenyl)pyrene and 1.65g (0.0135mol)
of phenyl boronic acid were put in 80mL of anhydrous THF and they are stirred in a
dried three neck round bottom flask.
[0048] 0.4g of tetrakis(triphenylphosphine)palladium(0) and 10g of potassium carbonate were
melted in 80mL of H
2O and added to the three neck round bottom flask. Then the reaction mixture was stirred
for 24 hours in a bath of 100□ and when a reaction was ended, THF was removed from
the reaction mixture.
[0049] Thereafter, the reaction mixture was extracted using dichloromethane and water and
distilled under a reduced pressure. The distilled mixture was purified by passing
through a silica gel column, then distilled under a reduced pressure again. The purified
and distilled mixture was recrystallized using dichloromethane and methanol and filtered.
Then, 1,5-di(4-(3'-pyridine)phenyl)-3,6-diphenylpyrene, which is a final product was
obtained.
[0050] [Brightness, color purity and driving voltage test 1]
[0051] In order to confirm brightness characteristic and color purity of organic light emitting
device according to an embodiment of this document, conventional organic light emitting
device and organic light emitting device according to an embodiment of this document
were manufactured and brightness, color purity, and a driving voltage thereof were
measured under the same condition.
[0052] In other words, organic light emitting device according to an embodiment of this
document was manufactured using the electron transport compound synthesized in the
synthesis example and conventional organic light emitting device was manufactured
using a conventional material in the electron injecting and transport layer. Then
brightness, color purity, and a driving voltage thereof were measured under the same
condition.
[0053] In examples, although some electron transport compounds according to embodiments
of this document are described, an organic light emitting device manufactured using
other pyrene based electron transport compound of chemical formula 1-1 may show the
same or similar result as examples. The result may be expected by those skilled in
the art and thus descriptions of other compounds will be omitted.
[0054] (1) A comparative example: Conventional organic light emitting device
[0055] ITO glass was washed after being patterned so that a light emitting area thereof
became 3mm X 3mm. After the substrate was mounted in a vacuum chamber, a hole injecting
layer/a hole transport layer/a green organic emitting layer (host+dopant)/an electron
injecting and transport layer/cathode (CuPc (650Å) /NPD(400Å) /Alq
3(200Å) +GD-1(1%)(50Å)/Alq
3(350Å)/LiF(5Å)/Al(1000Å)) were formed on ITO in 1.0X10
-6torr.
[0056] When current of 0.9mA was applied to the device, brightness was 1251cd/m
2, a driving voltage was 6.5V, and a value of a color coordinate CIE was x = 0.307
and y = 0.612.
[0057]
[0059] ITO glass was washed after being patterned so that a light emitting area thereof
became 3mm X 3mm. After the substrate was mounted in a vacuum chamber, a hole injecting
layer/a hole transport layer/a green organic emitting layer (host+dopant)/an electron
injecting and transport layer/cathode (CuPc(650Å) /NPD(400Å) /Alq
3 (200Å) +GD-1 (1%) (50Å) /PA-1(350Å)/LiF(5Å)/Al(1000Å)) were formed on ITO in 1.0X10
-6 torr. PA-1 is a pyrene based electron transport compound of chemical formula 1-6.
[0060] When current of 0.9mA was applied to the device, brightness was 2452cd/m
2, a driving voltage was 4.7V, and a value of a color coordinate CIE was x = 0.301
and y = 0.606.
[0061]
[0063] ITO glass was washed after being patterned so that a light emitting area thereof
became 3mm X 3mm. After the substrate was mounted in a vacuum chamber, a hole injecting
layer/a hole transport layer/a green organic emitting layer (host+dopant)/an electron
injecting and transport layer/cathode CuPc (650Å) /NPD (400Å) /Alq
3(200Å) +GD-1 (1%) (50Å) /PA-2(350Å)/LiF(5Å)/Al(1000Å) were formed on ITO in 1.0X10
-6torr. PA-2 is a pyrene based electron transport compound of chemical formula 1-7.
[0064] When current of 0.9mA was applied to the device, brightness was 2328cd/m
2, a driving voltage was 5.0V, and a value of a color coordinate CIE was x = 0.302
and y = 0.612.
[0065]
[0067] ITO glass was washed after being patterned so that a light emitting area thereof
became 3mm X 3mm. After the substrate was mounted in a vacuum chamber, a hole injecting
layer/a hole transport layer/a green organic emitting layer (host+dopant)/an electron
injecting and transport layer/cathode (CuPc(650Å)/NPD(400Å)/Alq
3(200Å)+GD-1(1%) (50Å)/PB-1(350Å)/LiF(5Å)/A1(1000Å)) were formed on ITO in 1.0X10
-6torr. PB-1 is a pyrene based electron transport compound of chemical formula 1-8.
[0068]
[0069] When current of 0.9mA was applied to the device, brightness was 2751cd/m
2, a driving voltage was 5.1V, and a value of a color coordinate CIE was x = 0.298
and y = 0.610.
[0071] ITO glass was washed after being patterned so that a light emitting area thereof
became 3mm X 3mm. After the substrate was mounted in a vacuum chamber, a hole injecting
layer/a hole transport layer/a green organic emitting layer (host+dopant)/an electron
injecting and transport layer/cathode (CuPc (650Å) /NPD (400Å) /Alq
3 (200Å) +GD-1 (1%) (50Å) /PC-1(350Å)/LiF(5Å)/Al(1000Å)) were formed on ITO in 1.0X10
-6torr PC-1 is a pyrene based electron transport compound of chemical formula 1-9.
[0072]
[0073] When current of 0.9mA was applied to the device, brightness was 2617cd/m
2, a driving voltage was 5.3V, and a value of a color coordinate CIE was x = 0.307
and y = 0.612.
[0075] ITO glass was washed after being patterned so that a light emitting area thereof
became 3mm X 3mm. After the substrate was mounted in a vacuum chamber, a hole injecting
layer/a hole transport layer/a green organic emitting layer (host+dopant)/an electron
injecting and transport layer/cathode (CuPc(650Å)/NPD(400Å)/Alq
3(200Å) +GD-1(1%) (50Å) /PE-1(350Å)/LiF(5Å)/Al(1000Å)) were formed on ITO in 1.0X10
-6torr. PE-1 is a pyrene based electron transport compound of chemical formula 1-10.
[0076]
[0077] When current of 0.9mA was applied to the device, brightness was 2472cd/m
2, a driving voltage was 5.4V, and a value of a color coordinate CIE was x = 0.31 and
y = 0.614.
[0078] (7) Example 6 - Organic light emitting device according to a sixth embodiment of
this document
[0079] ITO glass was washed after being patterned so that a light emitting area thereof
became 3mm X 3mm. After the substrate was mounted in a vacuum chamber, a hole injecting
layer/a hole transport layer/a green organic emitting layer (host+dopant)/an electron
injecting and transport layer/cathode (CuPc(650Å) /NPD(400Å) /Alq
3 (200Å) +GD-1 (1%) (50Å) /PF-1(350Å)/LiF(5Å)/Al(1000Å)) were formed on ITO in 1.0X10
-6 torr. PF-1 is a pyrene based electron transport compound of chemical formula 1-11.
[0080]
[0081] When current of 0. 9mA was applied to the device, brightness was 2217cd/m
2, a driving voltage was 5.5V, and a value of a color coordinate CIE was x = 0.302
and y = 0.610.
[0082] (8) Example 7 - Organic light emitting device according to a seventh embodiment of
this document
[0083] ITO glass was washed after being patterned so that a light emitting area thereof
became 3mm X 3mm. After the substrate was mounted in a vacuum chamber, a hole injecting
layer/a hole transport layer/a green organic emitting layer (host+dopant)/an electron
injecting and transport layer/cathode (CuPc (650Å) /NPD(400Å) /Alq
3(200Å) +GD-1 (1%) (50Å) /PK-1(350Å)/LiF(5Å)/Al(1000Å)) were formed on ITO in 1.0X10
-6torr. PK-1 is a pyrene based electron transport compound of chemical formula 1-12.
[0084]
[0085] When current of 0.9mA was applied to the device, brightness was 2830cd/m
2, a driving voltage was 5.0V, and a value of a color coordinate CIE was x = 0.297
and y = 0.609.
[0086] As can be seen in the comparative example and examples, when organic light emitting
device according to embodiments of this document comprise pyrene based electron transport
compound of chemical formula 1-1 described above in an electron injecting and transport
layer, a value of a color coordinate CIE was x = 0.397 to 0.307 and y = 0.606 to 0.612,
and thus it can be seen that an electron injecting and transport layer performs its
own function very effectively.
[0087] Referring to Table 1, brightness of organic light emitting device according to embodiments
of this document improves by minimum 77.2% (the sixth embodiment) and maximum 26%
(the seventh embodiment), compared to brightness of conventional organic light emitting
device. It can be seen that a driving voltage of organic light emitting device according
to embodiments of this document was decreased to 4.7V to 5.5V, compared to a driving
voltage of conventional organic light emitting device.
[0088]
[Table 1]
|
brightness |
driving voltage |
Comparative example |
1251cd/m2 |
6.5V |
Example 1 |
2452cd/m2 |
4.7V |
Example 2 |
2328cd/m2 |
5.0V |
Example 3 |
2751cd/m2 |
5.1V |
Example 4 |
2617cd/m2 |
5.3V |
Example 5 |
2472cd/m2 |
5.4V |
Example 6 |
2217cd/m2 |
5.5V |
Example 7 |
2830cd/m2 |
5.0V |
[0090] In order to achieve the object, this document provides a pyrene based electron transport
compound having chemical formula 2-1.
[0091]
[0092] Pyrene based compound of chemical formula 2-1 is a very important compound among
hydrocarbons. In the pyrene based compound, carbons are numbered clockwise starting
with a carbon having a substituent A-C. Accordingly, an electron transport compound
according to an embodiment of this document comprises a pyrene based compound in which
A-C is bonded to carbon 1 and B is bonded to carbon 3, 6 and 8. The substituents A,
B, and C may be substituted or not substituted.
[0093] The electron transport compound is a compound that injects an electron from a cathode
to other layer or transports an injected electron to other layers. For example, in
organic light emitting device, an electron transport compound is a compound that may
be a material of an electron injecting layer, an electron transport layer, or an electron
injecting and transport layer in which the electron injecting layer and the electron
transport layer are mixed.
[0094] In this document, the electron injecting and transport layer is used to generally
designate layers, which are related to injecting and transporting of an electron,
such as an electron injecting layer, an electron transport layer, or an electron injecting
and transport layer in which the electron injecting layer and the electron transport
layer are mixed.
[0095] A that is substituted or is not substituted may be selected from a group consisting
of pyridinyl, quinolinyl, isoquinolinyl, quinoxalinyl, bipyridinyl, terpyridinyl,
and phenanthrolinyl.
[0096] Further, B and C that are substituted or are not substituted may be selected from
a group consisting of phenyl, biphenyl, naphthyl, fluorenyl, terphenyl, phenanthrolinyl,
phenanthryl, and anthryl.
[0097] When the A, B, and C are substituted, a substituent of the A, B, and C may be selected
from a group consisting of aryl, alkyl, aryloxy, alkoxy, allylamino, alkylamino, halogen,
and cyano.
[0098] Further, when the A, B, and C are substituted, a substituent of the A, B, and C may
be selected from a group consisting of phenyl, biphenyl, triphenylmethyl, phenylethylidene,
diphenylethylidene, phenylmethylidyne, phenoxy, tolyoxy, methyl, ethyl, propyl, i-propyl,
t-butyl, cyclohexyl, diphenylamino, morpholine, methoxy, ethoxy, propoxy, butoxy,
dimethylamino, diphenylamino, fluorine, and chlorine.
[0099] The A that is substituted or is not substituted is given by chemical formulas 2-2
and 2-3.
[0100]
[0101] where any one of R1, R2, R3, R4, R5, and R6 is CH3, and the remaining ones are H.
[0102]
[0103] Similarly, the B and C that are substituted or not substituted are given by chemical
formula 2-4.
[0104] [Chemical formula 2-4]
[0105] Various forms of electron transport compounds can be formed by combining the pyrene
based electron transport compound of chemical formula 2-1 with substituents of chemical
formulas 2-2 to 2-4. The electron transport compounds can be easily selected from
organic light emitting device such as organic light emitting device by those skilled
in the art according to necessity of brightness, color purity, or a driving voltage.
[0106] This document provides organic light emitting device having the electron injecting
and transport layer comprising the electron transport compound described above. The
electron injecting and transport layer may be one or both of an electron injecting
layer or an electron transport layer. The electron injecting and transport layer may
be formed between an organic or inorganic light emitting layer and a cathode. The
electron injecting and transport layer may have a different layer position when participating
in injecting and transporting of an electron as described above.
[0107] Below, synthesis examples of some compounds of the pyrene based electron transport
compounds of chemical formula 2-1 are described. Only synthesis examples of some compounds
are described, but synthesis examples of other pyrene based electron transport compounds
of chemical formula 2-1 are similar to these synthesis examples, the synthesis examples
can be executed by those skilled in the art, and thus descriptions thereof will be
omitted.
[0108] [Synthesis Example]
[0109] 1-(4-(3'-pyridine)phenyl)-3,6,8-triphenylpyrene among electron transport compounds
of an electron injecting and transport layer of organic light emitting device according
to an embodiment of this document is synthesized as follows.
[0110] (1) Synthesis of 1-(4-(3'-pyridine)phenyl)pyrene
[0111]
[0112] 5.31g (0.0267mol) of 4-(3'-pyridine) phenyl boronic acid and 5g (0.0178mol) of 1-bromopyrene
were put in 100mL of anhydrous THF and they were stirred in a dried three neck round
bottom flask.
[0113] 1.0g of tetrakis(triphenylphosphine)palladium(0) and 15g of potassium carbonate were
melted in 100mL of H
2O and added to the flask. Then they were stirred for 24 hours in a bath of 100□ .
When a reaction was ended, THF was removed from a reaction mixture.
[0114] Thereafter, the reaction mixture was extracted using dichloromethane and water and
distilled under a reduced pressure then the distilled mixture was purified by passing
through a silica gel column. The purified mixture was distilled under a reduced pressure
again. The purified and distilled mixture was recrystallized using dichloromethane
and methanol and filtered. Then 1-(4-(3'-pyridine)-phenyl)pyrene was obtained.
[0115] (2) Synthesis of 1-(4-(3'-pyridine)-phenyl)-3,6,8-tribromopyrene
[0116]
[0117] 3g (0.0084mol) of 1-(4-(3'-pyridine)-phenyl)pyrene was put in 80mL of acetic acid
and they were stirred in a dried three neck round bottom flask. After 4.0g (0.0252mol)
of bromine (Br
2) was added to the reaction mixture at a room temperature and when a reaction was
ended, filtering was performed. By washing and then drying the reaction mixture with
excessive distilled water, 1-(4-(3'-pyridine)-phenyl)-3,6,8-tribrmopyrene was obtained.
[0118] (3) Synthesis of 1-(4-(3'-pyridine)phenyl)-3,6,8-triphenylpyrene
[0119]
[0120] 3g (0.00506mol) of 1-(4-(3'-pyridine)-phenyl)-3,6,8-tribromophylene and 2.47g (0.0202mol)
of phenyl boronic acid were put in 80mL of anhydrous THF and they were stirred in
a dried three neck round bottom flask.
[0121] 0.4g of (tetrakis(triphenylphosphine)palladium)(0) and 10g of potassium carbonate
were melted in 80mL of H
2O and added to the flask. Then they were stirred for 24 hours in a bath of 100□ .
When a reaction was ended, THF was removed from a reaction mixture.
[0122] Thereafter, the reaction mixture was extracted using dichloromethane and water and
distilled under a reduced pressure then the distilled mixture was purified by passing
through a silica gel column. The purified mixture was distilled under a reduced pressure
again. The purified and distilled mixture was recrystallized using dichloromethane
and methanol and filtered. Then 1-(4-(3'-pyridine)-phenyl)-3,6,8-triphenylenepyrene
was obtained.
[0123] [Brightness, color purity and driving voltage test 2]
[0124] In order to confirm brightness characteristic and color purity of organic light emitting
device according to an embodiment of this document, conventional organic light emitting
device and organic light emitting device according to an embodiment of this document
were manufactured and brightness, color purity, and a driving voltage thereof were
measured under the same condition.
[0125] In other words, organic light emitting device according to an embodiment of this
document was manufactured using the electron transport compound synthesized in the
synthesis example and conventional organic light emitting device was manufactured
using a conventional material in the electron injecting and transport layer. Then
brightness, color purity, and a driving voltage thereof were measured under the same
condition.
[0126] In examples, although some electron transport compounds according to embodiments
of this document are described, an organic light emitting device manufactured using
other pyrene based electron transport compound of chemical formula 1-1 may show the
same or similar result as examples. The result may be expected by those skilled in
the art and thus descriptions of other compounds will be omitted.
[0127] (1) A comparative example: Conventional organic light emitting device
[0128] ITO glass was washed after being patterned so that a light emitting area thereof
became 3mm X 3mm. After the substrate was mounted in a vacuum chamber, a hole injecting
layer/a hole transport layer/a green organic emitting layer (host+dopant)/an electron
injecting and transport layer/cathode (CuPc(650Å) /NPD(400Å) /Alq
3(200Å) +GD-1(1%) (50Å)/Alq
3(350Å)/LiF(5Å)/Al(1000Å)) were formed on ITO in 1.0X10
-6torr.
[0129] When current of 0.9mA was applied to the device, brightness was 1251cd/m
2, a driving voltage was 6.5V, and a value of a color coordinate CIE was x = 0.307
and y = 0.612.
[0130]
[0132] ITO glass was washed after being patterned so that a light emitting area thereof
became 3mm X 3mm. After the substrate was mounted in a vacuum chamber, a hole injecting
layer/a hole transport layer/a green organic emitting layer (host+dopant)/an electron
injecting and transport layer/cathode (CuPc (650Å) /NPD (400Å) /Alq
3 (200Å) +GD-1 (1%) (50Å) /TPA-1(350Å)/LiF(5Å)/Al(1000Å)) were formed on ITO in 1.0X10
-6torr. TPA-1 is an electron transport compound of 1-(4-(3'-pyridine)phenyl)-3,6,8-trhenylpyrene
of chemical formula 2-6 in which A is pyridine and B and C are phenyl.
[0133] When current of 0.9mA was applied to the device, brightness was 2511/m
2, a driving voltage was 5.1V, and a value of a color coordinate CIE was x = 0.301
and y = 0.610.
[0134]
[0136] ITO glass was washed after being patterned so that a light emitting area thereof
became 3mm X 3mm. After the substrate was mounted in a vacuum chamber, a hole injecting
layer/a hole transport layer/a green organic emitting layer (host+dopant)/an electron
injecting and transport layer/cathode CuPc(650Å) /NPD (400Å) /Alq
3(200Å) +GD-1 (1%) (50Å) /TPB-1(350Å)/LiF(5Å)/Al(1000Å)were formed on ITO in 1.0X10
-6torr. TPB-8 is a pyrene based electron transport compound of chemical formula 2-7
in which A is pyridine, B is biphenyl and C is phenyl.
[0137] When current of 0.9mA was applied to the device, brightness was 2830cd/m
2, a driving voltage was 5.1V, and a value of a color coordinate CIE was x = 0.300
and y = 0.607.
[0138]
[0140] ITO glass was washed after being patterned so that a light emitting area thereof
became 3mm X 3mm. After the substrate was mounted in a vacuum chamber, a hole injecting
layer/a hole transport layer/a green organic emitting layer (host+dopant)/an electron
injecting and transport layer/cathode (CuPc (650Å) /NPD (400Å) /Alq
3 (200Å) +GD-1 (1%) (50Å) /TPC-1(350Å)/LiF(5Å)/Al(1000Å)) were formed on ITO in 1.0X10
-6torr. TPC-1 is a pyrene based electron transport compound of chemical formula 2-8.
[0141]
[0142] When current of 0.9mA was applied to the device, brightness was 2770cd/m
2, a driving voltage was 5.3V, and a value of a color coordinate CIE was x = 0.302
and y = 0.611.
[0144] ITO glass was washed after being patterned so that a light emitting area thereof
became 3mm X 3mm. After the substrate was mounted in a vacuum chamber, a hole injecting
layer/a hole transport layer/a green organic emitting layer (host+dopant)/an electron
injecting and transport layer/cathode (CuPc (650Å) /NPD (400Å) /Alq
3 (200Å) +GD-1 (1%) (50Å) /TPE-1(350Å)/LiF(5Å)/Al(1000Å)) were formed on ITO in 1.0X10
-6torr TPE-1 is a pyrene based electron transport compound of chemical formula 2-9.
[0145]
[0146] When current of 0.9mA was applied to the device, brightness was 2069cd/m
2, a driving voltage was 5.5V, and a value of a color coordinate CIE was x = 0.304
and y = 0.614.
[0148] ITO glass was washed after being patterned so that a light emitting area thereof
became 3mm X 3mm. After the substrate was mounted in a vacuum chamber, a hole injecting
layer/a hole transport layer/a green organic emitting layer (host+dopant)/an electron
injecting and transport layer/cathode (CuPc(650Å)/NPD(400Å)/Alq
3(200Å) +GD-1 (1%) (50Å) /TPF-1(350Å)/LiF(5Å)/Al(1000Å)) were formed on ITO in 1.0X10
-6torr. TPF-1 is a pyrene based electron transport compound of chemical formula 2-10.
[0149]
[0150] When current of 0.9mA was applied to the device, brightness was 2466cd/m
2, a driving voltage was 5.7V, and a value of a color coordinate CIE was x = 0.300
and y = 0.610.
[0152] ITO glass was washed after being patterned so that a light emitting area thereof
became 3mm X 3mm. After the substrate was mounted in a vacuum chamber, a hole injecting
layer/a hole transport layer/a green organic emitting layer (host+dopant)/an electron
injecting and transport layer/cathode (CuPc(650Å) /NPD(400Å) /Alq
3 (200Å) +GD-1(1%) (50Å) /TPK-1(350Å)/LiF(5Å)/Al(1000Å)) were formed on ITO in 1.0X10
-6 torr. TPK-1 is a pyrene based electron transport compound of chemical formula 2-11.
[0153]
[0154] When current of 0.9mA was applied to the device, brightness was 2750cd/m
2, a driving voltage was 5.2V, and a value of a color coordinate CIE was x = 0.302
and y = 0.610.
[0155] As can be seen in a comparative experiment example, when organic light emitting device
according to embodiments of this document use the pyrene based electron transport
compound of chemical formula 2-1 described above in an electron injecting and transport
layer, a value of a color coordinate CIE was x = 0.300 to 0.307 and y = 0.607 to 0.614,
and thus it can be seen that an electron injecting and transport layer performs its
own function.
[0156] As can be seen in Table 2, brightness of organic light emitting device according
to embodiments of this document improves by minimum 77.2% (the sixth embodiment) and
maximum 26% (the seventh embodiment), compared to brightness of conventional organic
light emitting device. It can be seen that a driving voltage of organic light emitting
device according to embodiments of this document was decreased to 5.1V to 5.7V.
[0157] [Table 2]
|
brightness |
driving voltage |
Comparative example |
1251cd/m2 |
6.5V |
Example 1 |
2511cd/m2 |
5.1V |
Example 2 |
2830cd/m2 |
5.1V |
Example 3 |
2770cd/m2 |
5.3V |
Example 4 |
2069cd/m2 |
5.5V |
Example 5 |
2466cd/m2 |
5.7V |
Example 6 |
2750cd/m2 |
5.2V |
[0159] In order to achieve the object, this document provides a pyrene based electron transport
compound having chemical formula 3-1.
[0160]
[0161] Pyrene based compound of chemical formula 3-1 is a very important compound among
hydrocarbons. In the pyrene based compound, carbons are numbered clockwise starting
with a carbon having a substituent A. Accordingly, an electron transport compound
according to an embodiment of this document comprises a pyrene based compound in which
A is bonded to carbon 1, and B is bonded to carbon 3,6 and 8. The substituents A and
B may be substituted or not substituted.
[0162] The electron transport compound is a compound that injects an electron from a cathode
to other layer or transports an injected electron to other layers. For example, in
organic light emitting device, an electron transport compound is a compound that may
be a material of an electron injecting layer, an electron transport layer, or an electron
injecting and transport layer in which the electron injecting layer and the electron
transport layer are mixed.
[0163] In this document, an electron injecting and transport layer is used to generally
designate layers, which are related to injecting and transporting of an electron,
such as an electron injecting layer, an electron transport layer, or an electron injecting
and transport layer in which the electron injecting layer and the electron transport
layer are mixed.
[0164] A that is substituted or is not substituted may be selected from a group consisting
of pyridinyl, quinolinyl, isoquinolinyl, quinoxalinyl, bipyridinyl, terpyridinyl,
and phenanthrolinyl.
[0165] Further, B and C that are substituted or are not substituted may be selected from
a group consisting of phenyl, biphenyl, naphthyl, fluorenyl, terphenyl, methyl, ethyl,
propyl, i-propyl, halogen, phenanthrolinyl, phenanthryl, and anthryl.
[0166] When the A and B are substituted, a substituent of the A and B may be selected from
a group consisting of aryl, alkyl, aryloxy, alkoxy, allylamino, alkylamino, halogen,
and cyano.
[0167] Further, when the A and B are substituted, a substituent of the A and B may be selected
from a group consisting of phenyl, biphenyl, triphenylmethyl, phenylethylidene, diphenylethylidene,
phenylmethylidyne, phenoxy, tolyoxy, methyl, ethyl, propyl, i-propyl, t-butyl, cyclohexyl,
diphenylamino, morpholine, methoxy, ethoxy, propoxy, butoxy, dimethylamino, diphenylamino,
fluorine, and chlorine.
[0168] The A that is substituted or is not substituted is given by chemical formulas 3-2
and 3-3.
[0169]
[0170] where any one of R1, R2, R3, R4, R5, and R6 is CH3, and the remaining ones are H.
[0171]
[0172] Similarly, the B that is substituted or not substituted is given by chemical formula
3-4.
[0173]
[0174] Various forms of electron transport compounds can be formed by combining the pyrene
based electron transport compound of chemical formula 3-1 with substituents of chemical
formulas 3-2 to 3-4. The electron transport compounds can be easily selected by those
skilled in the art according to necessity of brightness, color purity, or a driving
voltage.
[0175] This document provides organic light emitting device having the electron injecting
and transport layer comprising the electron transport compound described above. The
electron injecting and transport layer may be one or both of an electron injecting
layer or an electron transport layer. The electron injecting and transport layer may
be formed between an organic or inorganic light emitting layer and a cathode. The
electron injecting and transport layer may have a different layer position when participating
in injecting and transporting of an electron as described above.
[0176] Below, synthesis examples of some compounds of the pyrene based electron transport
compounds of chemical formula 3-1 are described. Only synthesis examples of some compounds
are described, but synthesis examples of other pyrene based electron transport compounds
of chemical formula 3-1 are similar to these synthesis examples, the synthesis examples
can be executed by those skilled in the art, and thus descriptions thereof will be
omitted.
[0177] [Synthesis Example]
[0178] 1-(3'-pyridine)-3,6,8-triphenyl-pyrene among electron transport compounds of an electron
injecting and transport layer of organic light emitting device according to an embodiment
of this document is synthesized as follows.
[0179] Synthesis of 1-(3'-pyridine)pyrene
[0180]
[0181] 6.56g (0.053mol) of pyridinyl boronic acid and 5g (0.0178mol) of 1-bromopyrene were
put in 100mL of anhydrous THF and they were stirred in a dried three neck round bottom
flask.
[0182] 0.9g of (tetrakis (triphenylphosphine) palladium) (0) and 15g of potassium carbonate
were melted in 100mL of H
2O added to the flask. Then they were stirred for 24 hours in a bath of 100□ and then
when a reaction was ended, THF was removed from the reaction mixture.
[0183] Thereafter, the reaction mixture was extracted using dichloromethane and water and
distilled under a reduced pressure, then the distilled mixture was purified by passing
through a silica gel column. The purified mixture was distilled under a reduced pressure
again. The purified and distilled mixture was recrystallized using dichloromethane
and methanol and filtered. Then 1-(3'-pyridine)pyrene was obtained.
[0184] (2) Synthesis of 1-(3'-pyridine)-3,4,6-tribromopyrene
[0185]
[0186] 3g (0.0107mol) of 1-(3'-pyridine)pyrene was put in 80mL of acetic acid and was stirred
in a dried three neck round bottom flask. After 5.15g (0.0322mol) of bromine (Br
2) was added to the reaction mixture at a room temperature and when a reaction was
ended, filtering was performed. By washing and then drying the reaction mixture with
excessive distilled water, 1-(3'-pyridine)-3,6,8,-tribromopyrene was obtained.
[0187] (3) Synthesis of 1-(3'-pyridine)-3,6,8,-triphenyl-pyrene
[0188]
[0189] 3g (0.00581mol) of 1-(3'-pyridine)-3,6,8,-tribromopyrene and 2.83g (0.0232mol) of
phenyl boronic acid were put in 80mL of anhydrous THF and they were stirred in a dried
three neck round bottom flask.
[0190] 0.5g of (tetrakis(triphenylphosphine) palladium) (0) and 10g of potassium carbonate
were melted in 80mL of H
2O and H
2O and added to the flask. Then they were stirred for 24 hours in a bath of 100□ and
when a reaction was ended, THF was removed from the reaction mixture.
[0191] Thereafter, the reaction mixture was extracted using dichloromethane and water and
distilled under a reduced pressure, then distilled mixture was purified by passing
through a silica gel column. The purified mixture was distilled under a reduced pressure
again. The purified and distilled mixture was recrystallized using dichloromethane
and methanol and filtered. 1-(3'-pyridine)-3,6,8-triphenyl-pyrene, which is a final
product was obtained.
[0192] [Brightness, color purity and driving voltage test 3]
[0193] In order to confirm brightness characteristic and color purity of organic light emitting
device according to an embodiment of this document, conventional organic light emitting
device and organic light emitting device according to an embodiment of this document
were manufactured and brightness, color purity, and a driving voltage thereof were
measured under the same condition.
[0194] In other words, organic light emitting device according to an embodiment of this
document was manufactured using the electron transport compound synthesized in the
synthesis example and conventional organic light emitting device was manufactured
using a conventional material in the electron injecting and transport layer. Then
brightness, color purity, and a driving voltage thereof were measured under the same
condition.
[0195] In examples, although some electron transport compounds according to embodiments
of this document are described, an organic light emitting device manufactured using
other pyrene based electron transport compound of chemical formula 1-1 may show the
same or similar result as examples. The result may be expected by those skilled in
the art and thus descriptions of other compounds will be omitted.
[0196] (1) A comparative example: Conventional organic light emitting device
[0197] ITO glass was washed after being patterned so that a light emitting area thereof
became 3mm X 3mm. After the substrate was mounted in a vacuum chamber, a hole injecting
layer/hole transport layer/green color organic emitting layer (host+dopant)/electron
injecting and transport layer/cathode (CuPc(650Å)/NPD(400Å)/Alq
3(200Å)+GD- 1(1%)(50Å)/Alq
3(350Å)/LiF(5Å)/Al(1000Å)) was formed on ITO in 1.0X10
-6torr.
[0198] When current of 0.9mA was applied to the device, brightness was 1251cd/m
2, a driving voltage was 6.5V, and a value of a color coordinate CIE was x = 0.307
and y = 0.612.
[0199]
[0201] ITO glass was washed after being patterned so that a light emitting area thereof
became 3mm X 3mm. After the substrate was mounted in a vacuum chamber, a hole injecting
layer/a hole transport layer/a green organic emitting layer (host+dopant)/an electron
injecting and transport layer/cathode (CuPc(650Å) /NPD(400Å) /Alq
3(200Å) +GD-1(1%) (50Å) /TA-8(350Å)/LiF(5Å)/Al(1000Å)) were formed on ITO in 1.0X10
-6torr. TA-8 is an electron transport compound of 1-(3'-pyridine)-3,6,8-triphenyl-pyrene
of chemical formula 3-6 in which A is pyridine and B and C are phenyl.
[0202] When current of 0.9mA was applied to the device, brightness was 2403cd/m
2, a driving voltage was 5.87V, and a value of a color coordinate CIE was x = 0.301
and y = 0.621.
[0203]
[0205] ITO glass was washed after being patterned so that a light emitting area thereof
became 3mm X 3mm. After the substrate was mounted in a vacuum chamber, , a hole injecting
layer/a hole transport layer/a green organic emitting layer (host+dopant)/an electron
injecting and transport layer/cathode (CuPc(650Å)/NPD(400Å)/Alq
3(200Å)+GD-1(1%) (50Å)/TB-8(350Å)/LiF(5Å)/Al(1000Å)) were formed on ITO in 1.0X10
-6torr. TB-8 is a pyrene based electron transport compound of chemical formula 3-7 in
which A is pyridine and B and C are phenyl.
[0206] When current of 0.9mA was applied to the device, brightness was 2511cd/m
2, a driving voltage was 5.7V, and a value of a color coordinate CIE was x = 0.301
and y = 0.607.
[0207]
[0209] ITO glass was washed after being patterned so that a light emitting area thereof
became 3mm X 3mm. After the substrate was mounted in a vacuum chamber, a hole injecting
layer/a hole transport layer/a green organic emitting layer (host+dopant)/an electron
injecting and transport layer/cathode (CuPc(650Å) / NPD(400Å) / Alq
3(200Å)+GD-1(1%) (50Å) / TB-7(350Å)/LiF(5Å)/Al(1000Å)) were formed on ITO in 1.0X10
-6 torr. TB-7 is a pyrene based electron transport compound of chemical formula 3-8
in which A is pyridine and B is phenyl.
[0210]
[0211] When current of 0.9mA was applied to the device, brightness was 2398cd/m
2, a driving voltage was 5.3V, and a value of a color coordinate CIE was x = 0.304
and y = 0.630.
[0213] ITO glass was washed after being patterned so that a light emitting area thereof
became 3mm X 3mm. After the substrate was mounted in a vacuum chamber, , a hole injecting
layer/a hole transport layer/a green organic emitting layer (host+dopant)/an electron
injecting and transport layer/cathode (CuPc (650Å) /NPD (400Å) /Alq
3 (200Å) +GD-1 (1%) (50Å) /TC-8(350Å)/LiF(5Å)/Al(1000Å)) were formed on ITO in 1.0X10
-6torr. TC-8 is a pyrene based electron transport compound of chemical formula 3-9.
[0214]
[0215] When current of 0.9mA was applied to the device, brightness was 2382cd/m
2, a driving voltage was 5.6V, and a value of a color coordinate CIE was x = 0.299
and y = 0.617.
[0217] ITO glass was washed after being patterned so that a light emitting area thereof
became 3mm X 3mm. After the substrate was mounted in a vacuum chamber, a hole injecting
layer/a hole transport layer/a green organic emitting layer (host+dopant)/an electron
injecting and transport layer/cathode (CuPc (650Å) /NPD (400Å) /Alq
3(200Å) +GD-1 (1%) (50Å) /TD-8(350Å)/LiF(5Å)/Al(1000Å)) were formed on ITO in 1.0X10
-6 torr. TD-8 is a pyrene based electron transport compound of chemical formula 3-10.
[0218]
[0219] When current of 0.9mA was applied to the device, brightness was 2698cd/m
2, a driving voltage was 5.5V, and a value of a color coordinate CIE was x = 0.300
and y = 0.638.
[0221] ITO glass was washed after being patterned so that a light emitting area thereof
became 3mm X 3mm. After the substrate was mounted in a vacuum chamber, a hole injecting
layer/a hole transport layer/a green organic emitting layer (host+dopant)/an electron
injecting and transport layer/cathode (CuPc (650Å) /NPD (400Å) /Alq
3(200Å) +GD-1 (1%) (50Å)/TE-8(350Å)/LiF(5Å)/Al(1000Å)) were formed on ITO in 1.0X10
-6torr. TE-8 is a pyrene based electron transport compound of chemical formula 3-11.
[0222]
[0223] When current of 0.9mA was applied to the device, brightness was 2732cd/m
2, a driving voltage was 5.4V, and a value of a color coordinate CIE was x = 0.300
and y = 0.610.
[0225] ITO glass was washed after being patterned so that a light emitting area thereof
became 3mm X 3mm. After the substrate was mounted in a vacuum chamber, a hole injecting
layer/a hole transport layer/a green organic emitting layer (host+dopant)/an electron
injecting and transport layer/cathode (CuPc (650Å) /NPD(400Å) /Alq
3(200Å) +GD-1(1%)(50Å) /TF-8(350Å)/LiF(5Å)/Al(1000Å)) were formed on ITO in 1.0X10
-6torr. TF-8 is a pyrene based electron transport compound of chemical formula 3-12.
[0226]
[0227] When current of 0.9mA was applied to the device, brightness was 2287cd/m
2, a driving voltage was 5.5V, and a value of a color coordinate CIE was x = 0.300
and y = 0.618.
[0229] ITO glass was washed after being patterned so that a light emitting area thereof
became 3mm X 3mm. After the substrate was mounted in a vacuum chamber a hole injecting
layer/a hole transport layer/a green organic emitting layer (host+dopant)/an electron
injecting and transport layer/cathode (CuPc (650Å) /NPD(400Å) /Alq
3 (200Å) +GD-1 (1%) (50Å) /TG-8(350Å)/LiF(5Å)/Al(1000Å)) were formed on ITO in 1.0X10
-6torr. TG-8 is a pyrene based electron transport compound of chemical formula 3-13.
[0230]
[0231] When current of 0.9mA was applied to the device, brightness was 2096cd/m
2, a driving voltage was 5.7V, and a value of a color coordinate CIE was x = 0.304
and y = 0.629.
[0233] ITO glass was washed after being patterned so that a light emitting area thereof
became 3mm X 3mm. After the substrate was mounted in a vacuum chamber, a hole injecting
layer/a hole transport layer/a green organic emitting layer (host+dopant)/an electron
injecting and transport layer/cathode (CuPc(650Å)/NPD(400Å)/Alq
3(200Å)+GD-1 (1%) (50Å)/TJ-8(350Å)/LiF(5Å)/Al(1000Å)) were formed on ITO in 1.0X10
-6torr. TJ-8 is a pyrene based electron transport compound of chemical formula 3-14.
[0234]
[0235] When current of 0.9mA was applied to the device, brightness was 2937cd/m
2, a driving voltage was 6.1V, and a value of a color coordinate CIE was x = 0.307
and y = 0.609.
[0236] As can be seen in the comparative example and examples, when organic light emitting
devices according to embodiments of this document comprise the pyrene based electron
transport compound of chemical formula 3-1 described above in an electron injecting
and transport layer, a value of a color coordinate CIE was x = 0.300 to 0.307 and
y = 0.600 to 0.630, and thus it can be seen that an electron injecting and transport
layer performs its own function.
[0237] Referring to Table 3, brightness of organic light emitting device according to embodiments
of this document improves by minimum 67.5% (the eighth embodiment) and maximum 135%
(the ninth embodiment), compared to brightness of conventional organic light emitting
device. It can be seen that a driving voltage of organic light emitting device according
to embodiments of this document was decreased to 5.4V to 5.8V, compared to a driving
voltage of conventional organic light emitting device.
[0238]
[Table 3]
|
brightness |
driving voltage |
Comparative example |
1251cd/m2 |
6.5V |
Example 1 |
2403cd/m2 |
5.8V |
Example 2 |
2511cd/m2 |
5.7V |
Example 3 |
2398cd/m2 |
5.3V |
Example 4 |
2382cd/m2 |
5.6V |
Example 5 |
2698cd/m2 |
5.5V |
Example 6 |
2732cd/m2 |
5.4V |
Example 7 |
2287cd/m2 |
5.5V |
Example 8 |
2096cd/m2 |
5.7V |
Example 9 |
2937cd/m2 |
6.1V |
[0239] As described above, this document can provide an electron transport compound that
has high electron transport efficiency and good deposition characteristics, prevents
crystallization, and has no influence on a lifetime of diodes.
[0240] As a result, organic light emitting device according to embodiments of this document
can have improved brightness and a considerably low driving voltage while performing
a function as an electron injecting and transport layer, compared to conventional
organic light emitting device.
[0241] Embodiments are described, but this document is not limited thereto.
[0242] The invention being thus described, it will be obvious that the same may be varied
in many ways. Such variations are not to be regarded as a departure from the spirit
and scope of the invention, and all such modifications as would be obvious to one
skilled in the art are intended to be comprised within the scope of the following
claims.
1. An electron transport compound, having the following chemical formula,
wherein A that is substituted or is not substituted is selected from a group consisting
of pyridinyl, quinolinyl, isoquinolinyl, quinoxalinyl, bipyridinyl, terpyridinyl,
and phenanthrolinyl, and
B and C that are substituted or are not substituted are selected from a group consisting
of phenyl, biphenyl, naphthyl, fluorenyl, terphenyl, phenanthrolinyl, phenanthryl,
and anthryl.
2. The electron transport compound of claim 1, wherein when the A, B, and C are substituted,
a substituent of the A, B, and C is selected from a group consisting of aryl, alkyl,
aryloxy, alkoxy, allylamino, alkylamino, halogen, and cyano.
3. The electron transport compound of claim 1, wherein when the A, B, and C are substituted,
a substituent of the A, B, and C is selected from a group consisting of phenyl, biphenyl,
triphenylmethyl, phenylethylidene, diphenylethylidene, phenylmethylidyne, phenoxy,
tolyoxy, methyl, ethyl, propyl, i-propyl, t-butyl, cyclohexyl, diphenylamino, morpholine,
methoxy, ethoxy, propoxy, butoxy, dimethylamino, diphenylamino, fluorine, and chlorine.
4. An organic light emitting device having an electron injecting and transport layer
comprising the electron transport compound of Claim 1.
5. The organic light emitting device of claim 4, wherein the electron injecting and transport
layer is one or both of an electron injecting layer or an electron transport layer.
6. The organic light emitting device of claim 5, wherein the organic light emitting device
comprises an anode, an emitting layer comprising an organic material and a cathode,
wherein the electron injecting and transport layer is formed between the emitting
layer and a cathode.
7. An electron transport compound, having the following chemical formula,
wherein A that is substituted or is not substituted is selected from a group consisting
of pyridinyl, quinolinyl, isoquinolinyl, quinoxalinyl, bipyridinyl, terpyridinyl,
and phenanthrolinyl, and
B and C that are substituted or are not substituted are selected from a group consisting
of phenyl, biphenyl, naphthyl, fluorenyl, terphenyl, phenanthrolinyl, phenanthryl,
and anthryl.
8. The electron transport compound of claim 7, wherein when the A, B, and C are substituted,
a substituent of the A, B, and C is selected from a group consisting of aryl, alkyl,
aryloxy, alkoxy, allylamino, alkylamino, halogen, and cyano.
9. The electron transport compound of claim 7, wherein when the A, B, and C are substituted,
a substituent of the A, B, and C is selected from a group consisting of phenyl, biphenyl,
triphenylmethyl, phenylethylidene, diphenylethylidene, phenylmethylidyne, phenoxy,
tolyoxy, methyl, ethyl, propyl, i-propyl, t-butyl, cyclohexyl, diphenylamino, morpholine,
methoxy, ethoxy, propoxy, butoxy, dimethylamino, diphenylamino, fluorine, and chlorine.
10. An organic light emitting device having an electron injecting and transport layer
comprising the electron transport compound of Claim 7.
11. The organic light emitting device of claim 10,
wherein the electron injecting and transport layer is one or both of an electron injecting
layer or an electron transport layer.
12. The organic light emitting device of claim 11,
wherein the organic light emitting device comprises an anode, an emitting layer comprising
an organic material and a cathode,
wherein the electron injecting and transport layer is formed between the emitting
layer and a cathode.
13. An electron transport compound, having the following chemical formula,
wherein A that is substituted or is not substituted is selected from a group consisting
of pyridinyl, quinolinyl, isoquinolinyl, quinoxalinyl, bipyridinyl, terpyridinyl,
and phenanthrolinyl, and
B and C that are substituted or are not substituted are selected from a group consisting
of phenyl, biphenyl, naphthyl, fluorenyl, terphenyl, methyl, ethyl, propyl, i-propyl,
halogen, phenanthrolinyl, phenanthryl, and anthryl.
14. The electron transport compound of claim 13, wherein when the A and B are substituted,
a substituent of the A and B is selected from a group consisting of aryl, alkyl, aryloxy,
alkoxy, allylamino, alkylamino, halogen, and cyano.
15. The electron transport compound of claim 13, wherein when the A and B are substituted,
a substituent of the A and B is selected from a group consisting of phenyl, biphenyl,
triphenylmethyl, phenylethylidene, diphenylethylidene, phenylmethylidyne, phenoxy,
tolyoxy, methyl, ethyl, propyl, i-propyl, t-butyl, cyclohexyl, diphenylamino, morpholine,
methoxy, ethoxy, propoxy, butoxy, dimethylamino, diphenylamino, fluorine, and chlorine.
16. An organic light emitting device having an electron injecting and transport layer
comprising the electron transport compound of Claim 13.
17. The organic light emitting device of claim 16,
wherein the electron injecting and transport layer is one or both of an electron injecting
layer or an electron transport layer.
18. The organic light emitting device of claim 17,
wherein the organic light emitting device comprises an anode, an emitting layer comprising
an organic material and a cathode, wherein the electron injecting and transport layer
is formed between the emitting layer and a cathode.